NIFI-14873 - Support unquoted parameter references with spaces in the…

[rfellows]

…ir names within expression language

Summary

NIFI-14873

Tracking

Please complete the following tracking steps prior to pull request creation.

Issue Tracking

• Apache NiFi Jira issue created

Pull Request Tracking

• Pull Request title starts with Apache NiFi Jira issue number, such as NIFI-00000
• Pull Request commit message starts with Apache NiFi Jira issue number, as such NIFI-00000

Pull Request Formatting

• Pull Request based on current revision of the main branch
• Pull Request refers to a feature branch with one commit containing changes

Verification

• Create a parameter with a space in the name (like "Date Format" = 'yyyyMMdd').
• Add an update attribute processor, add an attribute use this value: ${now():format(#{"Date Format"})}, save the processor
• Before the change: the processor will report it is invalid due to a bad parameter reference
• With the change it should work

Build

• Build completed using ./mvnw clean install -P contrib-check
  • JDK 21